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19-2875; Rev 1; 12/03
ATION
EVALU
AVAIL
KIT
ABLE
High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
General Description
The MAX1553/MAX1554 drive white LEDs in series with
a constant current to provide efficient display backlight-
ing in cellular phones, PDAs, and other hand-held
devices. The step-up converter includes an internal
40V, low R DSON , N-channel MOSFET switch for high
efficiency and maximum battery life. The MAX1553 has
a current limit of 480mA for driving two to six white
LEDs, while the MAX1554 has a current limit of 970mA
for driving up to 10 white LEDs.
A single analog/PWM Dual Mode ? input provides two
simple means of brightness adjustment. A separate
enable input provides on/off control. Soft-start minimizes
inrush current during startup.
The MAX1553/MAX1554 are available in space-saving
8-pin TDFN 3mm x 3mm packages.
Applications
Features
? Constant-Current Regulation for Even LED
Illumination
? Internal 40V MOSFET Switch Capable of Driving
10 LEDs
? Small, Low-Profile External Components
? 2.7V to 5.5V Input Range
? Up to 88% Efficiency Driving 6 LEDs
? Up to 82% Efficiency Driving 9 LEDs
(20mA, V CC = 3.6V)
? Analog or PWM Control of LED Intensity
? Optimized for Low Input Ripple
? Soft-Start to Minimize Inrush Current
? 3mm x 3mm 8-Pin TDFN Package
Ordering Information
Cellular Phones
PDA, Palmtop, and Wireless Handhelds
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
Color Display Backlight
MAX1553 ETA
MAX1554 ETA
-40°C to +85°C 8 TDFN 3mm x 3mm
-40°C to +85°C 8 TDFN 3mm x 3mm
AGX
AGY
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2.7V TO 5.5V
INPUT
Typical Operating Circuit
TOP VIEW
Pin Configuration
V CC
LX
OFF
ON
EN
OV
WHITE
LEDS
GND
V CC
1
2
8
7
LX
0V
PWM
OR
BRT
MAX1553
MAX1554
FB
EN
BRT
3
4
MAX1553
MAX1554
6
5
SS
FB
DC CONTROL
SS
GND
TDFN
3mm x 3mm
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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